Optical device and optical transmitter

An optical device comprising:

• a generator that generates an electric signal of a multilevel amplitude modulation method;
• a light emitter that emits laser light according to a first drive current;
• a modulator that modulates the laser light using the electric signal and outputs an optical signal of the modulated laser light;
• an optical amplifier that optically amplifies the modulated optical signal according to a second drive current;
• a first current source that adjusts the first drive current to be supplied to the light emitter;
• a second current source that adjusts the second drive current to be supplied to the optical amplifier;
• a storage that previously stores a first information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the first drive current;
• and
• a controller that acquires, from the storage, the input-output characteristics corresponding to the drive current value of the first drive current and controls the electric signal based on the acquired input-output characteristics.

An optical transmitter that transmits an optical signal, the optical transmitter comprising:

• a generator that generates an electric signal of a multilevel amplitude modulation method;
• a light emitter that emits laser light according to a first drive current;
• a modulator that modulates the laser light using the electric signal and outputs an optical signal of the modulated laser light;
• an optical amplifier that optically amplifies the modulated optical signal according to a second drive current;
• a first current source that adjusts the first drive current to be supplied the light emitter;
• a second current source that adjusts the second drive current to be supplied the optical amplifier;
• a storage that previously stores a first information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the first drive current and/or a second information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the second drive current;
• and
• a controller that acquires, from the storage, the input-output characteristics corresponding to the drive current value of the first drive current and/or the drive current value of the second drive current and controls the electric signal based on the acquired input-output characteristics.